Is based on the novel Playing Nice by British author JP Delaney. He was also the author of The Girl Before which was adapted into a drama for the BBC.
The series appears to be filmed in one place when in actual fact each key scene is from a distinct part of Cornwall from North to South and including - St Ives (Gallery fund raiser), Mevagissey (the town seen from offshore), Newquay (Mawgan Porth - surfing), Penzance (Jubilee Lido - UK's largest), Watergate Bay (Restaurant), Bodmin Moor (Minions) & Bedruthan Steps (penultimate scenes).